Gas burner of multi section port construction



June 1958 F. B. JACKSON 2,840,151,

GAS BURNER OF MULTI SECTION PORT CONSTRUCTION Filed Sept. 6, 1955INVENTOR FRANCIS B. JACKSON BY 2 ATTORNEY United States atent 2,840,151GAS BURNER F MULTISECTION PORT CONSTRUCTION 7 Francis B. Jackson,Chattanooga, Tenn., assignor to Combustion Engineering, Inc, NewYork,'N. Y., a corporation of Delaware Application September 6,1955,'Serial No. 532,537 3 Claims. (Cl. 158-114) This invention relatesto gasburners and has specific reference to such a burner fabricated ofindividual port sections (preferably formed of pressed aluminized steel)secured together into an integral structure.

This novel burner organization has special application in (but is notrestricted to) the gas-fired house heating unit disclosed in U. S.Patent No. 2,700,505 issued January 25, 1955, to A. C. Jackson under thefitleof House Heating Unit and Automatic Control, Therefor. In heatingunitsof this type wherein several burners of varying capacities areemployed, it is essential, ,in order to meet competition, that theburners be extremely economical to manufacture yet highly efficient anddurable in operation. The novel burner herein disclosed meets theserequirements with an extremely high degree of satisfaction.

It is the general object of this invention .to provide .a'

gas burner that is very low .in first cost, readily adaptable tomanufacturing processes, and yet highly efficient and durable inoperation.

A further object is to .provide agas burner fabricated entirely ofpressed aluminized sheet steel that has individual port sections whichmay be built up as desired to obtain a necessary burner capacity. V

Another object-of the inventionis to provide a gas burner that isequipped with corrosion resisting reinforcements at the port areas.

Other and further objects of the invention will become apparent to thoseskilled'in the art as the description hereof proceeds.

With the aforementioned objects in view, the invention comprises anarrangement, construction and combination of the elements ofthe gasburner in such a manner .as to attain the results desired-as hereaftermore'particularly set forth 'in the following detailed description of anillustrative embodiment; said embodiment being shown by the accompanyingdrawings wherein:

Fig. l is a longitudinal sectional-view of the novel burnerorganizationdisclosing the interconnection of the individual portsections and the disposition of the helical battle within the portsections.

Fig. 2 is a sectional view taken along 2--2 of Fig. 1.

Fig. 3 is a plan view of a number of the individual port sections of theburner taken generally along line 33 of Fig. l.

Fig. 4 is an enlarged view of the edge portion enclosed within'circularline 4 in Fig. 1.

. Referring to the drawings wherein like reference characters are usedthroughout to designate like elements the novel burner is made up ,of aplurality of individual port sections rigidly secured together to .forman integral structure. Each of these sections has a generally V-shapedtransverse section (Fig. 2) and is made up of two parallel, pressedsteel walls 12 having their outer edges bent toward each other to definea chamber intermediate the wall. The lower or side edges 14 of the wallsof each section arein overlying relation with one of these edges.crimped over the other in a fluid tight manner as clearly shown inFigs.land 3. The top edges 16 are maintained in spaced relation to define anelongated slot 18 of restricted area relative to that of'the chamber forthe passage ofan air-gasmixture from the interior of :the chamber.

In accordance with the invention the top edges 16 are formed by addingexcess material 17 which is folded over, as indicated in Fig. 4.Accordingly the upper end parts of the Walls '12 defining the port area18 include coated portions 9 of the wall 12, rather than the exposedsheared edge as is the case in prior art designs.

To assist in maintaining the proper spacing between folded edges 16 andto give rigidity to the structure these edges are provided with inwardlyformed portions 19 that are held together by bending the clip 21 formedon one of the portions over the rim of the other portion.

Each of the walls 12 of each port section is formed with an outwardlyprojecting circular portion or rim 20 having an opening 22 provided.therein. When the several sections 10 that makeup a complete burner arein assembled relation circular portions 20 of adjacent walls of adjacentsections are in abutting relation and are secured together in a fluidtight manner by crimping the edge forming opening 22 in one wall overthe edge forming the opening in the immediate adjacent wall, as clearlyshown in Fig. 1.

The opening 22 formed in the endmost Wall of one of the end sections issealed by sheet. metal member 24, held Within said opening by a force'fit, while the opening in the endmost wall of the other section isconnected to inlet duct 26 in a fluid tight manner; the extremity of theduct being crimped over the edge of the opening for this purpose.

Positioned Within port sections 10 and extending through the openings 22is a suitable bafile 28, illustratively shown as a helical plate,effective to give an even velocity distribution to each of theportsections of the air-gas mixture entering the assemblage of sectionsthrough inlet duct 26.

During operation of this novel burner an air-gas mixture enters theassemblage of port section 10 through inlet duct 26. This mixturereceives a swirling motion .by baffle 28 which evenly distributes it toeach of the chambers defined by the port sections. The mixture .thenpasses from each of said chambers through slots 18 at a substantiallyuniform velocity, immediately thereafter mixes with secondary air, andburns with a short even flame. a

In fabricating the burner it is unnecessary that the numerous joints beWelded since, with the pressures at which these burners operate, anentirely satisfactory seal is obtainable with the crimped type of jointdisclosed. It is thus evident that this burner is readily adaptable torelatively inexpensive manufacturing processes and can be producedextremely rapidly at a very low cost.

During the manufacture of this burner, the port sections 10 and 12 arefirst stamped from aluminized sheet steel. A preferred material isaluminized steel type 1, special killed and oiled. These section plates10 and 12 are joined together centrally at 22 in Fig. 1 and the requirednumber of section assemblages are secured together at 14 and 21,.followingplacement of a distribution baflie 28 in the port assemblageplus attachment of air-gas mixing tube 26 to one end thereof and of endplate 24 to the other assemblage end.

in former designs these burner parts were fabricated of carbon steel andafter being assembled were aluminized both inside and out by precleaningand then dipping into a bath of molten aluminum While at a temperatureof 1400 F. I

Experience has shown however, that it is very ditficult tomaintainuniformity of temperature of the metal parts while preparing fordipping. This will cause inequality in the aluminum coating. Furthermoreit causes difiiculty in maintaining the elongated opening 18 .at auniform and predetermined width throughout the length thereof. Suchfacturing.

irregularity of opening is undesirable since it changes the shape anduniformity of the flame. In order to correct these faults in earlierburner designs, that require dipping .in an aluminum bath, additionalhand labor must be performed whichadds considerably to the cost of manu-In a burner designed and constructed in accordance .with the presentinvention the above disadvantages have been entirely eliminated byutilizing aluminized sheet steel and in addition by providing the burnerport area with reinforcements 17 which not only add strength to edge,16, exposed to highest operational temperatures, but which above allprovides this uppermost edgeportion a 19 with protection againstpossible corrosive action by condensation drippage. h V 7 By buildingthe burnerof individual port sections great fiexibility in capacity isprovided since the capacity of a with outwardly projecting cylindricalportions 20 the major portion of said adjacent walls 12 are spaced fromone another providing a passage through which secondary air is admittedto both sides of elongated slots 18. This allows an eflicient andimmediate mixing of the secondary I air with the air-gas mixture,passing through the elongated slots, permitting'faster combustion of thegas and lowering of the over all flame height. Moreover, the newconstruction shown lowers the temperature of the complete burner byreason of secondary air admission to both; ,4 sides of the burner and byfurther reason of the reflective qualities of the aluminized surface.

In fabricating, the burner. pressed steel, aluminized, killed and oiledbefore fabrication of the burner assembly,

is preferably employed because ofits relatively low cost ability of theburner to withstanding the deteriorative effect ,of'hig'h temperaturesand to resist corrosion are greatly increased over that of anyheretofore known comparable burner.

While a preferred embodiment of the gas burner has been illustrated anddescribed it is to be understood that such is, merely illustrative andnot restrictive ,and that variations and, modifications may be madetherein without departing from the spirit and scope of the invention.

It is therefore to be understood that the invention is not limited tothe precise details set forth but includes'such changes and alterationsas fall within the purview thereof.

What is claimed is: 0'

l. A gas burner fabn'cated entirely of sheet steel that is aluminizedprior to burner assembly and comprising a unit madeup of a plurality ofsimilar, aligned, juxtaposed, fluidlycenterconnected sections arrangedin accordian fashion, an, inlet duct connectedito one of the endmostsections, each of said sections including a pair of generally V-shaped,parallel, aluminized sheet metal walls having their edges bent towardeach other thereby forming a chamber with .theedges of said wallsforming the top of the:Vbeing spaced to form a slot for the egress ofgas and the remaining edges being secured together in a fluid tightmanner and the edge of the wall portions forming the slot being rawunprotected steel, said slotforming edges being folded over away fromsaid slot to 4 form a rounded edged rim surrounding said slot, saidsections being disposed with their walls parallel to one another withadjacent walls of adjacent sections and the end wall to which the inletductis secured having aligned openings, an outwardly raised rim formedabout each of said openings, withthe rims formed on adjacent walls ofadjacent sections being secured together, and bafile means positionedwithinisaid unit and extending through the alignedlop eningsoperable toevenly distribute tocach of the sections the'gas entering the unitthrough the inlet duct.

2. A gas burner of the type described comprising a plurality of sectionsdisposed in parallel spaced apart planes and having a common transverseaxis, each of said sections including a pair of generallytriangular-shaped walls of sheetmetal' coated with a protective metalprior to burner fabrication facing one another outwardly dished andsecured together along two of the edges of the triangle by crimping theedge of one wall over the edge of the other thereby formingachamberbetween the walls, the third edge of the triangle being spaced to forman elongated slot of restricted section relative to that of the chamberfor the egress of a gaseous fuel from the chamber, said thirdslot-forming edge being of .raw unprotected'steel and folded over awayfrom said slot more than 90 degrees to form a rounded edged rim definingsaid slot, each of 'sa'id'walls having an outwardly raised surfacelocated centrally intermediate said two edges and adjacent the apexformed by the juncture of said two edges with this surface ofadjacentsections being in abutting relation thereby spacing the major portion ofadjacent walls of adjacent sections from each other providing'a passagefor the free flow of air, said abutting surfaces having aligned openingsformed therein with the rim of one opening crimped over the rim of theadjacent opening, one of the endmost walls having an inlet opening,

an inlet duct coaxial with said openings and having its downstream endcrimped over the rim of the opening in said endmost wall, and bafflemeans extending through said aligned openings and operative to evenlydistribute the fuel to the several sections. v

3. A gas burner comprising in combination a plurality .of sheet metalsections coated with aprotective coating prior to fabrication anddisposed in parallel spaced apart planes, each of said sectionsincluding a pair of sheet metal plates facing one another and dished .toform a chamber therebetween, these plates being secured together alongall but a portion of their perimetrical edgesby crimping the edge of oneplate over the edge of the other,

said portions of said edges being spaced to forma slot for the egress ofgaseous fuel from the chamber with thc wall portions forming the slotsbeing reversely bent so that they extend away from the extreme edge ofthe slots and with the edge of these wall portions being raw metal,

an inlet duct connected to one of the endmost plates, adjacent plates ofadjacent sections being spaced with the sections being in communicationwith eachfother through openings in said adjacent plates with theopenings being in alignment, an outwardly raised rim formed about atleast one of the openings in said adjacent plates with said adjacentplates being secured together by having the rim of one opening crimpedover that of the other,

and balfie means extending through said aligned openings and operative.to evenly distribute the fuel to the several sections.

' References Cited in the file of this patent UNITED STATES PATENTS

